Monoazo dye.



ALBERT EDWARD GES$LER, OF CLIFTON, NEW YORK.

MONOAZO DYE.

No Drawing.

r v Specification of Letters Patent. I Application filed October 31,1910. Serial No. 590,081.-

Patented'Ju'ly 23,1912.

' To all whomc' t may concern:

Be it known that I, -ALBERT: EDWARD GEssLnR, a subject of the German Empire, residing at Clifton,

ed 'new and useful Improvements in the Manufacture of Monoazo Dye, of which the following is a specification.

My inventionconsists in the production of a new mono-azo coloring matter which is especially valuable 111 consequence of its practical insolubility in oil and water which can be used in the manufacture of printing ink lakes, paints, colored papers and'in dyeing and in calico printing without sublimation.

My new dye may be produced'byco'mbining .diazotized alpha-naphthylamin with the salts of 2':7-naphthol-mono-sulfonic acid. In the form of its alkali salts it is to In the is-practi'cally ins01u some extent soluble in hot water. form of its free acid it ble in water. salts as those with aluminum, barium, calcium, lead or the like it has a brilliant deep and is practically inand practically insensible to the action of light and heat and it does not sublime as many of the insoluble azo dyes do.

The new mono-azo-dye is further characterized by the reaction with concentratedsulfuric acid, in'which, it is soluble with a dark blue color. On suitable treatment with reducing 'agents' it will yield alpha-naphthylamin and amino-2-naphthol=7-sulfonic acid.

The following formula will show the manner in which my inventionis carried out and my new coloring matter. obtained.

Example :qDissolve about twelve (12) parts of .alpha-naphthyla'min in a solution of twenty-five (25) parts of hydrochloric acid of about 20 B. strength in three hundred (300) parts of hot water. Cool downwith ice to about 0 ce'h tigrade and slowly introduce therein a solution of seven (7) partsof sodium nit-rate dissolved in about two hundred (200) parts of water at 0 centigrade; stir for about half an hour, filter it and add twenty-five (25') parts of so dium acetate, then fill up with water to fifteen hundred (1500) parts.

temperature at 0' centigrade then run this in the county of Richparts of-water at 0 mond and State ofNew York, have'inventproduce the free acid, the

the manufacture of lakes,

'In the form of its lakes or",

oil, benzol or varnish,

Keep the liquid into a solution of about twenty 20) about eleven (11') parts of caustic soda lye of 35% .NaOH, stir well and allow to stand.

Then heat up, filter,-press and dry. In this way my new coloring matter is obtained inthe form of its'sodium salt. In order to sodium salt may be treated, before drying,

with acids, for instance diluted hydrochloric acid and then filtered. and washed until .neutral. In order to obtain the new coloring matter in the parts of the sodium salt of 2:7-napht 01-, sulfonic acid in three thousand (3000) centigrade containing form of-its metallicsalts. or lakes thesodium salt or free acid of the dye may be treated with salts,of the respective metal either before or, after washing. If desired these combinations may be madetin the presence of. a substratum or base as now used in for-instance, ba-

riurn sulfate, whiting, aluminum, hydroxid,

or the like. v 4 I For dyeing or'calico printing nay-new azo dye can be produced directly on thefiber. It is valuable for this character otwork as it does not sublime.

Having described my invention, what I claim and desire to secure by Letters Patent -of the United States, is:

.1. As, a new article of manufacture, the

-monoazo'coloring matter obtained by diazotizing alpha naphthylamin and combining the diazo compound 1 thus obtained with 2 :7-naphthol-mono-sulfonic acid, forming when dried, a dyestufi' of a dark red color which is insoluble in water but is solublein concentrated sulfuric acid, changing when so treated-to a dark blue color but which yields, on suitable reduction,palpha'-'naphthylamin and amino-2maphthol-7-sulfonic acid, substantially as set forth.

. 2. As a new-article ofmanufacture, the

lakes employed as coloring matter containing a mono-azo dyestufi derived from diazotized alpha-naphthylamin and 2 :7-naphtholmono-sulfonic acid which by treatment with reducing agents yield alpha-naphthylamin stantially as set'forth. a v I 1 ALBERT EDWARD GESSLER- Witnesses: A. A. SMITH, ROBERT J L PULLAR. I

Copies 0! this Bii6l1t may be obtained icz'ralve cents each, by y Washingtcn, D. G.

and amino-2-naphthol-7-sulfonic acid, subaddressing the Commissioner of Patents; 

